Forced-draft-furnace grate.



W. H. PALMER.

FORGED DRAFT FURNACE GRATE.

APPLIOATION FILED JAN. 21', 1909.

958,971 I Patented May 24, 1910.

2 sums-sum 1.

' W. H. PALMER.

FORCED DRAFT FURNACE GRATE.

APYLIOATION FILED JAN. 21, 1909.

Patent May 24, mm.

2 SHEETS-SHEET Z.

mmnroz (run STATES Par s curios.

WILLIAM HOWARD PALMER, OF FORT SCOTT, KANSAS.

liORCED-DBAFT-FURNACE GIBATE.

Specification 011' Letters retest.

Patented May 24:, 319th.

Application filed January 21, 1909. Serial No. 478,404.

nres in construction and in combinations and. arran 'ei'nents of partsand formations as more i'uhy and particularly set forth herein W to theaccompanying drawl, is a cross section through a furnace bed or grateconstructed since with my invention. Fig. 2, is n View of a grate barthereof. Fig. ide elevation of one of the grate bars a. l .g. l, is avertical longitudinal- Figs.

nrough a portion of said bar.

are detail views of the rings and of he air blast outlets. vie sillustrating a modified formation openings and plates.

improved furnace bed or grate is pary' intended to receive fuel in afinely rate such as slack or the like and to end is constructed withoutopenings or therethrough except for blasts of "ly' upward into the fuelon the bed. is what might be termed closed or a, .lntESlllllCll as noopenings or spaces are provided through which fuel can drop or escape,the object being to necessitate comhustion of all fuel introduced intothe furonto the grate as the iuel cannot escape l I tuel was introduced.To this end I form tile ru rnace bed or grate of a suitable number oispaced and usually parallel hollow Figs. 7 and 8 t by the door openingthrough whichgrate bars (generally indicatedby 1, in Fig. 1,) andintervening packing and supporting means throughoutthe bed completely'clos ing the spaces between the grate bars, and su orting the ratebars.

. ollow grate %fil' carrying ledges or other suitable su ports areprovided along the furnace wa ls surrounding the furnace bed or rate,and at intermediate points between sai walls. For instance in theparticular example illustrated, I show parallel i i-beams 2,horizontally arranged within the furnace and at their ends supported byopposite fur-- nace walls or in any other suitalne manner.

These beams can extend longitudinally of the furnace, that is, from thefront to the rear thereof, and such distance apart that the rate barscanrest on the beams and dc pen between the same and preferably so thateach intermediate beam will receive and partially carry two grate bars.

The spaces between the upper portions of the grate bars are closed andfilled in by suitable packing material such for instance as refractorymaterial and to this end, l show them other bricks or refractorymaterial blocks 3, laid transversely of the spaces between the gratebars'and a fine packing 4., of suitable sand closing interstices betweenthe bricks and the bars and covering the bricks about to the level ofthe top faces of the grate bars. It will hence be observed that thegratebars are stationary or fixed, and the grate or furnace bed as anentirety is fixed or stationary and the closed top surface thereof ismade up of the top faces of the rate bars and the intervening surfaces0? packing or filling material so that it is not ossible for fuel towaste by drop- "ping or allingthrough said furnace grate,

or bed.

' Each grate bar is longitudinally hollow and is normally closed exceptfor the blast or compressed air inlet and the top blast outlet openings.Each bar is preferably composed of two longitudinal sections, the loweror supporting section 5, and the upper or fuel supporting section 6. Thelower section is usually composed of a longitudinal trough-like casting0 so at the top and closed at the ends, si es and bottom and with itssides inclining or converging toward the list bottom wall. This lowersection is formed with an internal horizbntal supporting seator ledge50, along the inner faces Oil its sides and ends and a comparativelyshort distance below the fiat top edges 51, of. its sides and ends. Thelower section is also formed with an exterior horizontal projectingsupporting flange or ledge 52,

extending along the opposite sides and ends with the ledge 52, at theends of the bar resting on supports at the front and rear furnace walls.The lower section is formed at one end with a depending nipple or otherconnection 53, to receive the blast pipe or other sourceof compressedair for delivery to the grate bar. also be formed with a series ofvertical ash discharge holes or perforations 54, drilled through theflat floor of the section and normally closed by a fiat slide 55,arranged longitudinally within and resting on the floor of the sectionand allowed a limited longitudinal movement therein to close saidopenings or to bring them into alinement or re istration withcorresponding openings 56 through the slide for the purposes hereinafterexplained. This slide can be confined and limited in its movement bybolt 56, passing through longitudinal slot 57. The slide can bereciprocated through the medium of its perforated lug 58, dependingthrough slot 59.

The top or fuel supporting section 6, of the grate bar is usually formedby a casting in the shape of an inverted trough open at the bottom andhaving a top wall, and closed side and end walls. The side walls and endwalls are vertical and usually parallel respectively. upper section isformed to slip or fit down into the open upper end of the lower orsupporting section until its lower edge seats on the internal supportingledge 50 of the 'lower section, whereby the top section. is

supported and upheld. An eirterior air tight joint 60, can be formedbetween the sections by introducing cement between the overlapping outersurfaces of the upper section and inner surfaces of the lower sec-- tionabove the seat 50, whereby the two sections are secured. together toform the hol low bar.

A longitudinal series of separate and spaced air blast slits or openingsare formed through the flat top wall of the grate bar and each openingis formed upwardly flan,

ing by a surrounding downwardly and inwardly beveled edge 61, and eachopen-ing is centrally or diametrically bridged by a depressed horizontalnarrow bar or web in these openings, I. arrange suitable plates Thelower section can The lower side of this.

eeaen tied down to the webs 62, by bolts 63, arranged centrally withinthe plates and openings. For instance, in the round openings, I show aremovable ring 64, having a beveled edge corresponding generally to theedge 61, and formed with edge stop points (55, to engage edge 61, sothat when the ring is placed in the opening with the top face of thering about flush with the top face of the grate bar, a narrow annularslit for discharge of air will be formed between edge 61, and thebeveled edge of the ring. A separate removable cap 66, can be provided.for each ring to close the open center of the ring except forintervening slits 67, for discharge of air between the cap and inneredge of the ring. The cap is provided with radial lugs 68, overlappingthe ring and removably fitting in sockets depressed in the top face ofthe ring, to hold the same down in position. tral depending boss or stop69, resting on the top face of the web (32. The bolt 63 passes centrallyand removably through the cap and web 69., to hold or clamp the cap downto the web. If so desired, the grate bar top can be formed with a seriesof spaced parallel elongated openings arranged transversely of the bartop provided with elongated beveled-edge removable plates-70, flush withthe bar top and forming the slits 71, around the plates and betweentheir edges and the beveled edges cf the openings, each plate having acein' ral depending stop boss 72, resting on the web 32, bridging theopening, and a removable central vertical confining bolt 73, passingthrough the plate, boss and web to hold the plate down to its operativeposition.

In the event that line ash or other dust should drop through the slitsand accumulate in the hollow grate bars, any suitable hooked-end pokeror other manually operated instrument can be inserted through thefurnace front and beneath the grate and successively engage with theperforated lugs 58, to successively reciprocate the cleaner plates orslides 55, on the grate bar floors. I holes 547, 56, will beperiodically brought into registration, whereupon the compressed air inthe grate bars will expel the dust and ashes downwardly through saidholes into .the ash pit of the furnace below the grate.

In the preferred formation of grate or furnace bed shown by Fig. 1, eachgrate bar is supported. by two beams 2-, and the fiat top head of eachbeam receives side supporting flanges 52, of two adjacent bars so thatthe beam closes the space above the beam and between the grate barsiroin the space below the furnace bed, and the filling bricks '3, arelaid transversely between the grate bars and on and upheld by theexterior ledges 51 of the ad acent bars, a distance The cap is formedwith a cen-.

As said slides are reciprocated the seam above 52, and the beams 2. Bythis arrangement the beams 2, are insulated and protected from the heatof the furnace not only by the bricks 3, and packing a, but

, also if so desired by dead air space 20. Any grate bar can he removedfor repair or otherpurpose by removing the adjacent bricks and packingsupported thereby 'and then lifting the bar: from the beams withoutdisturbing the remaining bars and bricks and.

paclri ng.

It is evident that various changes might, 'be resorted to in the forms,constructions and arrangements of theparts described and hence I do notwish to limit myself to the exact construction disclosed.

l. A forced-draft furnace bed comprising supporting beams, ,hollow gratebars parallel with and between and resting on said beams and extendingupwardly above the horizontalplane of said beams and having topforced-draft outlets and filling material between said bars and closingthe spaces above said beams and between the bars.

2A forced-draft furnace grate comprising spaced supporting beams, hollowgrate bars parallel therewith and havingintermediate' flanges resting onsaid beams, said bars having top draft outlets and side ledges, andbricks in the spaces between said bars above said beams and supported bysaid ledges.

3. A hollow grate bar for a forced-draft furnace bed having top draftoutlets and horizontal exterior opposite side flanges, and

bricl'c supportingledges above'saicl flanges.

i. it hollow grate bar having top air discharge openings, and throughoutthe length of its sides provided with longitudinal ledges for supportingfilling material for closing the spaces between ad acent bars, and withlongitudinal bar supporting portions, substantially as described.

5. A forced-draft furnace bed closed against the downward passageof'fuel therethrough and comprising parallel spaced hollow grate barshaving top air outlets,-

supporting beams arranged longitudinally of and'parailel with andbetween said bars, and removable refractory material filling laidbetween said bars and above said beams to close the spaces between saidbars.

63, A furnace bed comprising spaced suppor l,- is, l'ioil s grate barsail; d longitudinally between. said beams and pro jecting above theplane of the beams and having top air outlets and longitudinal sideflanges resting on the beams and upholding the bars, and fuel-supportingmeans closing the spaces above said beam and flanges and between the topportions of sa d bars.

7. A closed forced-draft furnace bed com- .prising grate bar supportingbeams, series of hol ow grate. bars arranged between and restinglongitudinally on said beams and having air outlets in their topfuel-support-- ing faces, said bars having side supporting ledgesarranged above said beams and below their upper ends, and fuelsupporting mate-- rial closing the spaccs ctween the top por tions ofthe bars and supported by said ledges.

8. A closed .forced.dra ft furnace bed com-- prising spacedsupportingbeams, hollow grate bars having top air outlets, said bars resting onsaid beams and arranged between thesame and provided with sidesupporting portions adapted to uphold fuel supporting means, andfuelsupporting means closing the spaces between the bars and above thebeams and forming dead air spaces above the beams and below the fillingmaterial, substantially as described.

9. A forced-draftfurnace bed comprising ,spaced hollow grate bars havingtop air outlets and side supporting ledges bQlOW the horizontal plane oftheir upper ends, and bricks arranged in the spaces between t bars andlaid on said ledges, substantialiy as described.

19. A hollow forceddraft grate bar ha ing top air outlets and provided.along its longitudinal sides with filling material-sun; porting'ledges,said bar formed of longitudinal sections fitted one within the otherwith their adjacent walls spaced apart to form an exterior cementreceiving socket between the interfitting portions of the sec-- tions.

11. A closed forced-draft furnace bed comprising in combination, spacedhollow bars provided with top air discha openings, supporting bea. isarranged n tween and parallel with. said bars a 2.. the tops thereof,and filling material arranged between top portions of said ba and aboveand spaced from said bee thereby forming air spaces between the b in andabove the beams and beneath said filling material.

12. A closed furnace bed comprising ries of spaced parallel hollowgratei: provided with top air discharge openii filling material closing,the spaces betwei 1 said bars and resting on and supported l) the bars,and packing material laid thereo between the tops of the b as ties Y edforced draft furnace bed comprising an combination,

spaced supporting' beams, hollow grate bars having top air dischargeopenings, said bars restingon arranged between, and parallel with s "ibeams, and series of bricks spanning the spaces between th-e bars andabove th beams.

M. A forccddraft furnace bed compr ing in combination, spaced hollow gbars having top air discharge openi enfl lls anal on open hol the opentop of 35 e- -";oni seciion receiving she open botixon top section loform the co1n- 'gvlele hollow hen emu. ssh vino; trough having meui'isfor (liscnsrging' Lslies therelron. H

18. combinatimi, in s forceclwlrsfl; furinure heal, series of hollowgrate burs each consisting; of two longitudinal sections. one of whichis open at the top and forms an ash receiving trough provided with meansfor removing ushcs from the interior thereof and the other section beinghollow and open vi lhe boztom and having 1" approximately lint lop fuelsupporting wall provided with an blast openings and also ffillne il withYfil' fllll side and end walls, snel fuel supso porting means closingthe spaces between the vertical side nulls of top sections of scliiureulgrate bars, the upper section of each grate has being carried by thelower section shereof and as its lower edges litteil 5 therein. y it 1..u; orced-(leafs furnace bed comprising in combination, sunporting beams,spscccl hollow grate bsirs arranged between and longitudinally of s ulbeams" and each 40 consis'ning oi :1 ion al bottom seccion havingex'licirioc i iions 'i'esiingg on two adjucent beams and a longiiuclinultop section haying" on cliscliui' e openings in lop wail" soul topsection extending above said e5 lower section and 21%; its lower portionfitted to said lower section and filling material arranged between thetop scciions of the mljscc l hers and shove the lower sections of iihezuijscen burs.

c0 18. A ,ruie l. for a forced-draft its top well formed with ins-s andwith e rigicl on lily on under across ouch o ening, i u rg u'o inalelyclosnm nil siscl'nii'ge slits to QXAQ'HQG said meets 1o Sllhl IErleuenuino- 1 i boils conhnu on soul top portions of the bars,substantially as described.

In combination, in s forced-draft furnace bccl, series of supportingbcams series of hollow rate bars carried. by said beams, the beams ceingarranged in the spaces between she bars with the bars extending abovethe horizontal plane of the beams, fuel supporting means arrangedbetween. lhe

upper portions of the bars and closing the bur eoznposeil olf upper andlower longitudi nul sections, the botion'i section having anuuobslructecl interior and forming an ash TBCQlVlEI trough provided withmeans for the discharge of ashes therefrom snii having exterior sicloflanges, the top section comprising sshi flss'top wall and being fittedin and carried by said bottom section.

22. A. foirceil draft furnace bed having approximately flat level fuelsupporting surfaces closing ihe bed against clown. draft and fuelpassage therethrough and comprising a hollow grate bar having a fist topfuel supporting well formed with upwardly fluring air discharge slitsand otherwise closed, said ban.- composed of upper and lowcilongitudinalsections, the bottom section forming on ssh receiving trough havingspaced ash discharge openings through. llTS floor, a slide on said floorand normally closing said openings and having holes adopted to registertherewith for the discharge of ashes from solid trough, and mesh;tqleucling to the exterior of the trough whereby said slii'le can bereciprocat the section 23: A ones draft furnace boil havingapproximately fie; level fuel supporting surfaces closing "1c beoagainst clown (inv t nncl fuel possess re'through and. coinpi' O l e be?lisvin a list to :mel.

mil forinecl with air elischsrge or composed of uppes and lower (lsecions the bottom seclion bs iiuctecl interim and formtrongh normallyclosing said securing said plates to said a said bottom sectio 24. Ahollow grate bar for a forced draft furnace bed having a flat top fuelsupporting wall formed with spaced openings, fiat platesfitted in saidopenin s and in con: junction with the edges of the wall around saidopenings forming air discharge slits, said top wallhaving portionsbridging said openings close beneath said plates, means portions andthereby leaving the interior of obstructed, said bar formed inlongitudinal sections, the bottom section formin an ash receiving troughand provided witi means for the discharge of ashes therefrom, the topsection comprising said Wall and being fitted to the bottom section. V

25. A hollow grate bar for a forced draft said bar un furnace bed closedagainst downward passage of fuel therethrough, said bar having a at topfuel supporting Wall formed with air discharge slits, and composed oflongitudinal. sections, the bottom section supporting the upper sectionand forming an ash receiving trough having an ash (118- I charge openingand means normally closing the same, the top section comprising said topWall and at its lower portion fitted in the upper portion ofsaid bottomsection, the adjacent walls of said sections sp to form an exteriorcement receiving socket between the interfitting portions of thesections, substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses.

WILLIAM HOWARD PALMER. Witnesses:

JAMES M. HUMPHREY, GRACE E. STONER.

aced apart

